一步一步做一个linux文件传输软件（四）
第三章实现了客户端向服务器发送一个字符A，服务器接收该字符后便将其打印出来。
这一章将实现，客户端可以多次向服务器发送一个字符串。就是你在客户端可以输入多次，你输入啥，客户端就给你发送到服务器去。然后服务器再给你打印出来。
这一章的代码在三的代码上修改非常少，第三章是发送一个字符，我们发送一个数组。数组里面存储着你想发送的字符串。
以下便是代码：
1 /***************************************************************************
2 * * *
3 * * * Filename: client.c
4 * * *
5 * * * Description: Network Client , transfer character or string to server
6 * * *
7 * * * creater: tian 2015.9.9
8 * * *
9 * * * version: 1.0
10 * * *
11 * * * change:
12 * * *
13 * * ***************************************************************************/
14 #include <stdio.h>
15 #include <stdlib.h>
16 #include <string.h>
17 #include <unistd.h>
18 #include <arpa/inet.h>
19 #include <netinet/in.h>
20
21 #define SERV_PORT 8000
22 #define PACK_SIZE 100
23
24 int main(int argc, char **argv)
25 {
26 int Client_socket = 0;
27 int Socket_len = 0;
28 int result = 0;
29 char pack[PACK_SIZE];
30 struct sockaddr_in server_addr;
31
32 Client_socket = socket(AF_INET, SOCK_STREAM, 0);//create a socket
33 if(-1 == Client_socket)
34 {
35 perror("socket");
36 exit(1);
37 }
38
39 memset(&server_addr, 0, sizeof(server_addr));
40
41 server_addr.sin_family = AF_INET;
42 server_addr.sin_addr.s_addr = inet_addr("127.0.0.1");
43 server_addr.sin_port = htons(SERV_PORT);
44
45 result = connect(Client_socket, (struct sockaddr*)&server_addr, sizeof(server_addr));//c onnect the server
46 if(-1 == result)
47 {
48 perror("connect");
49 exit(1);
50 }
51
52 while(1)
53 {
54 printf("Please input:\n");
55
56 memset(pack, 0 , PACK_SIZE);//init the array pack
57 fgets(pack, PACK_SIZE, stdin);
58
59 result = write(Client_socket, pack, PACK_SIZE);//send out the string
60 if(-1 == result)
61 {
62 perror("write");
63 }
64 }
65
66 close(Client_socket);//close the socket
67
68 exit(0);
69 } 1 /***************************************************************************
2 * * *
3 * * * Filename: server.c
4 * * *
5 * * * Description: Network server, accept A from server
6 * * *
7 * * * creater: tian 2015.9.9
8 * * *
9 * * * version: 1.0
10 * * *
11 * * * change:
12 * * *
13 * * ************************************************************************/
14 #include <stdio.h>
15 #include <stdlib.h>
16 #include <string.h>
17 #include <sys/types.h>
18 #include <sys/socket.h>
19 #include <unistd.h>
20 #include <arpa/inet.h>
21 #include <netinet/in.h>
22
23 #define SERV_PORT 8000
24 #define PACK_SIZE 100
25
26 int main(int argc, char **argv)
27 {
28 int Listen_socket = 0,New_socket = 0;
29 int result = 0;
30 int len = 0;
31 char pack[PACK_SIZE];
32 struct sockaddr_in server_addr,Client_addr;
33
34 Listen_socket = socket(AF_INET, SOCK_STREAM, 0);//create a socket
35 if(-1 == Listen_socket)
36 {
37 perror("socket");
38 exit(1);
39 }
40
41 memset(&server_addr, 0, sizeof(server_addr));
42
43 server_addr.sin_family = AF_INET;
44 server_addr.sin_addr.s_addr = htonl(INADDR_ANY);
45 server_addr.sin_port = htons(SERV_PORT);
46
47 result = bind(Listen_socket, (struct sockaddr *)&server_addr, sizeof(server_addr));//Named the socket
48 if(-1 == result)
49 {
50 perror("bind");
51 exit(1);
52 }
53
54 listen(Listen_socket,20);//momitor the connect fro client
55
56 len = sizeof(Client_addr);
57 New_socket = accept(Listen_socket, (struct sockaddr *)&Client_addr, &len);//receive a connect and create a new socket
58 if(-1 == New_socket)
59 {
60 perror("accept");
61 exit(1);
62 }
63
64 while(1)
65 {
66 memset(pack, 0, PACK_SZIE);//init the array
67
68 result = read(New_socket, pack, PACK_SIZE);
69 if(-1 == result)
70 {
71 perror("read");
72 exit(1);
73 }
74
75 printf("receive:\n");
76
77 fputs(pack, stdout);//print the received string
78 }
79
80 close(New_socket);
81 close(Listen_socket);//close the socket
82
83 exit(0);
84 }
85 结果：（记得首先开启服务器）
从代码中就可以看出，我们在客户端增加了一个数组，用数组存储要发送的字符串。在服务器端也增加了一个数组，接收从客户端发送而来的字符串。
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